Some official Web sites of regionally accredited colleges

Question

Some official Web sites of regionally accredited colleges have received the highest possible rating from the Federal Department of Education. However, all official Web sites of nationally accredited colleges have received the highest possible rating from the same department.

Which of the following, if added to the statements above, would provide most support for the conclusion that all Web sites administered by individuals holding advanced degrees in educational technology have received the highest possible rating from the Federal Department of Education?


a. Only official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

b. All official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

c. Only Web sites that have not received the highest possible rating from the Federal Department of Education are administered by individuals not holding advanced degrees in educational technology.

d. All official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

e. No Web site administered by individuals holding advanced degrees in educational technology is an official Web site of a regionally accredited college.

ncp · Answer

Seems to be a very straight forward A.

shoonya · Answer

B and D are same. what is the source of this question?
answer should be B/D.

somethingbetter · Answer

NCPrasad , you are right. explain please. I answered same as Shoonya. It's from Peterson's.

ncp · Answer

We need to prove that all web sites administered by individuals with advanced degrees(Adv) received the highest possible rating (H).

i.e,  All Advs are H 

From the argument some of the regional web sites received the highest rating while all national web sites received the highest rating.

 Some R are H -> 1
All N are H -> 2 

Combine 1 and 2, we get 
 H = All N + some R  

In order to prove that all Advs are H, we need to prove that all Advs fall under the union of N and some R.

Lets say R consists of R1, R2, R3 and R4 and further assume that R1 and R2 received the highest rating while R3 and R4 did not.

Thus  H = All N + R1 + R2. 

Now, its obvious that if an individual with an advanced degree was involved with a regional web site, he could have been involved with either R3, R4. Thus, it will be illogical to conclude with certainty that all web sites developed by him/her received the highest rating.

 By showing that All Advs are N and no Advs are R, we eliminat the uncetainty and can thus establish that All Advs are H. 

 a. Only official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.  

A does just that.

Now, lets look at B and D. They say that All N are Advs, but do not prove that all Advs are N. Meaning Adv could be R3 or R4 and thus not receive the highest rating.

I haven't written a detailed CR explanation in a while. So bear with me if this is clear as mud.

shoonya · Answer

can you explain, as if you are explaing to a layman, the difference between A and B?

 
a. Only official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

b. All official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.
 

To me, they both mean the same. 

A says that although the nationally accredited colleges have many websites (official and unofficial both), only the official websites are administered by highly educated guys.

whereas

B says that all official websites of nationally accredited colleges are administered by highly educated individuals. So, where is the difference?

ncp · Answer

Your interpretation of A is incorrect. The 'only' in A indicates that 'only national websites were administered' meaning the regional websites were not administered. 

A doesn't mean that only official websites were adminstered and that there are other unofficial websites.

shoonya · Answer

prasad, following is the question stub:

 Some official Web sites of regionally accredited colleges have received the highest possible rating from the Federal Department of Education. However, all official Web sites of nationally accredited colleges have received the highest possible rating from the same department. 

so, the stub is talking abt the official websites of  regionally accredited colleges  and  nationally accredited colleges . 

 Your interpretation of A is incorrect. The 'only' in A indicates that 'only national websites were administered' meaning the regional websites were not administered.  

Now, what do you mean by regional website in the above explanation? there is nothing like this mentioned in the stub. It's either the official website of nationally accredited colleges or the official website of regionally accredited colleges. 

I still believe that A,B/D give us the same information.

any comments?

ncp · Answer

shoonya,

For the sake of brevity and because I am bleary eyed at 1 am in the morning, I wrote regional web sites instead of typing 'websites of regionally accredited colleges'. Does this help you?

Yawn... :sleeping:

b14kumar · Answer

Hey Shoonya,

What Prasad has explained is making sense to me.
There is a subtle difference between A and B. (D is same as B, SC source to be blamed)

Well, we need to prove that  ALL  websites administered by  individuals holding advanced degrees in educational technology  have received the highest possible rating.

Let us assume that individuals holding advanced degrees in educational technology have also administered  SOME  official Web sites of  regionally accredited colleges  which  have not  been rated highest. 
So in this case we can not say that  ALL  websites administered by individuals holding advanced degrees in educational technology have received the highest possible rating.

If individuals holding advanced degrees in educational technology have administered  ONLY  official Web sites of nationally accredited colleges then we CAN say that  ALL  websites administered by ndividuals holding advanced degrees in educational technology have received the highest possible rating because  ALL  official Web sites of nationally accredited colleges have received the highest possible rating from the same department.

I hope it helps you.

Good explaination Prasad.

- Brajesh

shoonya · Answer

Some official Web sites of regionally accredited colleges have received the highest possible rating from the Federal Department of Education. However, all official Web sites of nationally accredited colleges have received the highest possible rating from the same department.

Which of the following, if added to the statements above, would provide most support for the conclusion that all Web sites administered by individuals holding advanced degrees in educational technology have received the highest possible rating from the Federal Department of Education?

a. Only official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

b. All official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

c. Only Web sites that have not received the highest possible rating from the Federal Department of Education are administered by individuals not holding advanced degrees in educational technology.

d. All official Web sites of nationally accredited colleges are administered by individuals holding advanced degrees in educational technology.

e. No Web site administered by individuals holding advanced degrees in educational technology is an official Web site of a regionally accredited college. 

 

Prasad, in that case, there is no difference between A and B.

b14kumar · Answer

Shoonya,

Please see if my explanation can help you.
I do endorse Prasad's views.

-Brajesh

Dr MBA · Answer

agree w/ the expl. & would like to point that there is a whole world of difference b/w only and all. (eg i only date guys/gals from X college v/s i date ALL of them, which doesnt even exclude colleges a, b &c)

asaf · Answer

* ALL official Web sites of ntionally accredited colleges have received ratings.

* SOME official Web sites of regionally accredited colleges have received ratings.

* ALL Web sites administered by individuals holding advanced degrees in educational technology have received the ratings.

B satisfies the conditions

Some official Web sites of regionally accredited colleges

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards